[lvc-project] [PATCH v2] scsi: elx: efct: adjust error handling inside efct_hw_setup_io

[Daniel Wagner]

On Sat, Feb 10, 2024 at 02:08:33PM +0300, Fedor Pchelkin wrote:
> IO and WQE buffers are allocated once per HW and can be reused later. If
> WQE buffers allocation fails then the whole allocation is marked as failed
> but already created IO array internal objects are not freed. hw->io is
> freed but not nullified in that specific case - it may become a problem
> later as efct_hw_setup_io() is supposed to be reusable for the same HW.
> 
> Also rollback if HW IO objects initialization loop fails due to memory
> allocation error.
> 
> While at it, use kcalloc instead of kmalloc_array/memset-zero combination
> and get rid of some needless NULL assignments: nullifying hw->io[i]
> elements just before freeing hw->io is not really useful.
> 
> Found by Linux Verification Center (linuxtesting.org).
> 
> Fixes: 4df84e846624 ("scsi: elx: efct: Driver initialization routines")
> Cc: stable at vger.kernel.org
> Suggested-by: Daniel Wagner <dwagner at suse.de>
> Signed-off-by: Fedor Pchelkin <pchelkin at ispras.ru>
> ---
> v2: per Daniel Wagner's notice, handle the other possible memory
>     allocation errors inside the function.

Looks good to me! Thanks!

Reviewed-by: Daniel Wagner <dwagner at suse.de>